Without those ramps, a large proportion of residents in the southern Wollongong suburbs will have a hard time getting on the bypass to travel south.

But it remains unclear whether the government is listening.

At present there is a lack of southbound on-ramps between the start of the bypass and Dapto.

Both Fowlers Road and Kanahooka Road overpasses only have on ramps for northbound traffic.

The nearest crossroad that offers access for southbound traffic is Northcliffe Drive - seven kilometres north of the start of the bypass.

With the Yallah interchange - which would provide southbound access to the bypass for residents in Dapto, Kanahooka, Brownsville and other suburbs - not being constructed, it causes a problem for those motorists.

They will either have to travel north to Northcliffe Drive and then head south along the motorway, or drive along the Princes Highway like they do now while others speed along the Albion Park Rail bypass.

"When the bypass is complete, 65 per cent of traffic is expected to transfer off the existing Princes Highway through Albion Park Rail," a Transport for NSW spokeswoman said.

"This will improve travel times for Dapto residents traveling south on the highway."

While the spokewoman said a study of the motorway between Figtree and Dapto is under way, it is unclear whether extra on-ramps are an option.

"Planning and investigation work is in very early stages, and involves the analysis of a range of factors including the roadside environment, traffic volumes and crash history," she said.

"As part of this planning, Transport for NSW will assess a range of scenarios and options to understand both the current and future network performance.

"This will be used to inform the Illawarra-Shoalhaven Future Transport Plan. The plan will guide future transport planning for the Illawarra-Shoalhaven region."